K&N 99-5000 Aerosol Recharger Filter Care Service Kit https://www.amazon.com/dp/B00029WYEY
This kit is for cleaning and prepping the reusable K&N car filters. It's the lowest it's been in awhile and is nice to have on hand come the spring.
When using the filter oiler be careful to not overspray and heavily saturate it as, It can supposedly lead to some of that oil blowing onto your mass airflow sensors as written on some forums.
K&N addresses it here : https://www.knfilters.com/MAF/massair.htm