Black Ops HEPA Filter Cleaner is a concentrated formula designed to mix with water. No solvents are required to clean Black Ops® treated foam air filters. The cleaner breaks down the waterproofing chemicals of the Black Ops® filter oil, before completely washing the oil, grease, dust and dirt from the filter. The non-toxic, no-fume, no-odor cleaning solution is skin safe and can be used to clean filters in a bucket of water or the kitchen sink. It’s biodegradable, so go ahead and dump the dirty solution right down the drain!