I had a sheet vinyl kitchen for and white sheet vinyl flooring in the 60s & 70s. I washed often with dawn dish soap. If it got any dirt in the cracks I just let the solution sit for a while then mopped it up. Never a problem. We had three young kids at home. I did wash it on my hands and knees at least once a week. Being that close to the floor I could get and keep it clean very easily.