The greatest air filter oil ever. I used to use the spray on oil. Goes on good and works good, but is a pain in the butt when it's time to clean. Alcohol doesn't get it clean. Gas works but then you have that dirty gas to deal with and it breaks your filter down. No Toil is not harmful for your filter and cleans out super well in the sink with the cleaner. I put my oil in a spray bottle for easier application. I think it's a little pricey but worth it.
I really like No Toil products- the bio friendly product is great. You wash it in your sink with no harmful chemicals or gas. Your filter comes out cleaner than ever. It is to be used with the No Toil cleaner and air filter oil. It is kinda expensive but for me it's worth not having to deal with cleaning my filter with gas.
I have used a lot of different ways to clean and oil my filters, the No-Toil system is the only way to go. It cleans the filter without harsh chemicals to damage the filter or your hands, and the oil works as good as anything I have used and I have been doing this for 57 years.