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!