I buy the Scotcbrite with sponge on one side and the green scrubby on the other. I like them best when very well used and am extremely careful when they are new. It takes very little pressure to clean off caked grimy spots, especially when cleaning with clear ammonia, ( I can only dream of a boiling trichlorethane tank Peter!). I've never damaged or scratched up any wood with them but don't really use them as sandpaper. It's apples and oranges. I try to avoid scraping and sanding if possible on collectable rifles but do it carefully when called for and always use a sanding block. I'd love to have a heated linseed tank for working in the winter but I simply don't need it here in summer when it's 100f in the sun out back. At around $55 a gallon with shipping, I can make it last a long, long time by applying it the TLC way.