I have used filter skins, spry on oil, pour on oils, blah, blah, blah. I have found the no toil to clean up easy(hot water and cleaner mixed in bucket, put dirty filter in, swish and squeeze a couple of (dozen)time and then rinse. I have been using a parts washer with a mild solvent for years but the dirt contaminates the solvent so fast that it was getting expensive. The no toil complaint I have is the opposite ofTTR guy, I use 3 or 4 bottles of oil to one bottle of cleaner. Of course, re use the cleaner water as i do several filters at once but the oil goes quick. The rubbing(isopropyl) alcohol smells strong but evaporates quick and leaves the filters tacky(I worried about not having enough stickum at first). I am still in testing and cost comparison mode but it seems that the first kit with the filter almost makes the system pay for itself.