Howdy BGD, I grow in DWC. I clean the reservoirs with a 50/50 mix of white vinegar and water soak overnight and then a good scrub and rinse. I then soak them over night, again, using a 50/50 mix of bleach and water, and then a final throw rinse with water. I use isopropyl alcohol to clean the other tools, pruning shears, thermometers, and pumps. I clean the air stones by soaking them in jars in hydrogen peroxide for a couple of days.