I should add that best practices for using DMSO topically is to clean the area to be swabbed with DMSO well. After application of DMSO, typically at 70% concentration, the user is advised to let the area dry for 20 minutes before putting clothing on or allowing any substance to touch the wet DMSO, except maybe surgical gauze. This is because DMSO acts as a universal solvent that can easily mix with other substances and can pass these substances through biological membranes without damaging them - a property unique among known substances.
Synthetic fragrances, cosmetics, and chemical-based skin products should be completely removed before DMSO application. Even chlorinated pool water should be avoided when using DMSO, as it could carry harmful chlorine compounds into the body.
For cleaning the skin prior to DMSO application, are soap and water sufficient?