Two years ago we moved to a house with a septic system and well water. Until then I always washed up maintenance items (latex paint brushes/rollers, citrus solvent for bike cleaning, etc) in a utility sink, which fed into town sewer. Now that i'm on a septic system, I'm concerned about putting anything into the system that isn't (human-processed) food waste. The system is 20 years old, has been cleaned recently (no issues found, just a lot of crap!), and is sized for a 4 bedroom house. We probably run more water through it than we should...there's typically two of us in the house...but we run dishwasher and washing machine a couple of times a week... How do others handle this? Thanks!