|Key people||S. C. Johnson & Son|
||This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (October 2011)|
Mr Muscle is a brand of hard surface cleaners. It has been manufactured by S. C. Johnson & Son, since their purchase of Drackett from Bristol-Myers Squibb in 1992. The original product – an aerosol oven cleaner – was developed at Drackett in 1986. The Mr. Muscle product lineup has since expanded.
Oven cleaners at the time of introduction (1986) were pretty much all the same as Reckitt & Colman's Easy-Off, the leading brand. A strong base such as caustic soda attacked grease by saponification. Surfactants attacked both grease and food spills. An abrasive may be present to help scour the oven. The product worked better if the oven was hot, and working in a fairly close space with hot oven cleaner fumes was unpleasant, to say the least.
Appliance manufacturers offered continuous-clean ovens, which had a special coating. Consumers, however, discovered these ovens were rarely cleaned by the process. Additionally, supplemental use of chemical cleaners destroyed the special coating that enabled continuous-clean to function. Manufacturers next offered self-cleaning ovens, which allows the oven to run at a special high-temperature setting, effectively burning food residue into a carbon deposit. Early self-cleaning ovens weren't thoroughly satisfactory. At worst, they left carbon stuck to the oven surfaces. At best, they left carbon residue on the oven floor.
Industry legend has it that Drackett researchers, while trying to find a cold oven cleaner, found that ammonia would plasticize food spills, making them easier to remove. However, this took hours - and ammonia would evaporate in that time. Looking for a less volatile chemical with the general characteristics of ammonia, they found that monoethanolamine had similar properties.
MEA is a weak base, so it required the addition of caustic soda as well as surfactants and bentonite as an abrasive. Like most household cleaning aerosols, the propellant is a blend of propane and isobutane. Because the product required significant time to work properly, it was marketed as an overnight oven cleaner.
The product quickly grew to be the second best-selling oven cleaner. The product's popularity was limited by the strong fumes it created, as well as the length of time required to thoroughly clean. Consumers were not thrilled at the prospect of awakening in the morning to the task of wiping chemicals, carbon and grease out of their ovens. There was no official website for Mr Muscle,[clarification needed] suggesting that S. C. Johnson wasn't excited at growth potential of the product. However, there is now one available for the public to view.
In 1994 there was some controversy regarding Mr Muscle after complaints over the potency of the cleaning agents within the product, which were thought to be unnecessarily high and of a level that could lead to potential health problems.
The UK study by the Welsh Regional Burns and Plastics Unit, Chepstow found:
"Mr Muscle is the proprietary name for a brand of household cleaning preparations produced by Bristol-Myers Co. Ltd of Uxbridge, Middlesex, UK. Recently manufacturing and marketing rights were purchased by Johnson Wax Ltd of Camberley, Surrey, part of S.C. Johnson and Son Inc. of Racine, Wisconsin, USA. The spray-on oven cleaner has been the causal link in a series of six deep dermal and full thickness skin burns admitted to the Welsh Regional Burns and Plastic Unit during the period January 1990 to July 1992. These patients will be discussed as a series of case reports. The constituents of the cleaner, its mode of action, packaging and presentation, together with regulations controlling its use will be discussed. Also a treatment regimen, with a plan of prevention for future burns, will be proposed. Information from the Johnson Wax group regarding recent revisions in the marketing of the product will also be presented."—Welsh Regional Burns and Plastics Unit
The US Department of Health and Human Services (HHS.gov), which lists household product information for heatlth and safety, lists the Health & Effects information taken from the Mr Muscle product label and/or the Material Safety Data Sheet (MSDS) prepared by the product manufacturer. Mr Muscle is rated as a scale 3 (serious) for Health and a 4 (severe) for Flammability (using the established HMIS, Hazardous Materials Identification System).
Other hard surface cleaners
The brand includes other hard surface cleaners. Products include bathroom and toilet cleaning, glass and surface cleaners, floor cleaners and polishes, kitchen cleaners and degreasers and more.  These products are sold in Europe, Asia, Latin America and Africa under the brand names Mr. Muscle or Mr. Musculo. S. C. Johnson also sells similar products in other parts of the world under the Duck® and Scrubbing Bubbles® brands. 
- Harper, R; Dickson, W (1994). "Mr Muscle® oven cleaner — is he too strong for us?". Burns 20 (4): 336–9. doi:10.1016/0305-4179(94)90063-9. PMID 7945824.
- Aydin, Hasan Utkan; Basat, Salih O.; Uğurlu, Alper M.; Karabulut, Aylin B. (2009). "Unusual Burn Injury in a Child Caused by a Cleaning Agent". Journal of Burn Care & Research 30 (5): 907. doi:10.1097/BCR.0b013e3181b48783. PMID 19692927.
- "Product Name: Mr Muscle Oven and Grill Cleaner". Household Products Database. U.S. Department of Health & Human Services.
- "Mr. Muscle®: A cleaning hero for your home". S.C. Johnson. Retrieved 26 November 2012.
- Mr Muscle official UK website
- Mr Muscle in the United Kingdom
- Mr Muscle Range in Germany
- Mr Muscle named “The Most Hygienic Cleaner” in Turkey
- Mr Muscolo Italian Official Website
- NIH Household Product Database entry
- How Self Cleaning Ovens Work Article by HowStuffWorks.com
- U.S. Patent 4,167,488