Can I use this on my kn furnace filter

No, the K&N Air Filter Cleaner and Degreaser: Power Kleen 99-0621 is only for use on engine air filters. The correct cleaner for the K&N HVAC air filter is the 99-6010.

Do they make this in aerosol form? Trigger will do fine I'm sure, just can't stand the small pump spray bottle.

I've never seen an aerosol form. the one I bought was just like the picture shown, like Windex or other household cleaners.

I have 2 k&n filters and 1 aem dryflow filter. can i use the k&n to clean both, or should i only use the aem brand for the aem filter?

AEM filters are dry flow so you don't spray them with oil like the K&N's. The K&n cleaner is formulated to clean their filters, removing the old oil too. It would probably work fine on AEM,just being a little more harsh but why chance it. It could degrade the element over time. I'd use their stuff so as not to void any warranty. Better yet would be to get all K&N's and be done with it. One brand, one cleaner. Just a thought. Good luck.

Will this work for cleaning a mass air flow sensor?

No!!! A simple search for “mass air flow sensor cleaner “ will yield some products.

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⚡ Clean smarter, drive stronger — don’t let a clogged filter slow your hustle!

TRUSTED BY K N - The only cleaner officially recommended to protect your filter’s warranty and longevity.
SAFE SPECIALIZED - Formulated exclusively for K&N cotton media filters—never use gasoline or other cleaners that risk damage.
EFFORTLESS CLEANING - Power Kleen’s powerful formula dissolves buildup for easy rinsing with just water—no harsh chemicals needed.
RESIDUE FREE FINISH - Leaves no residue behind, ensuring your filter breathes freely and performs optimally.
RESTORE PEAK PERFORMANCE - Quickly removes oil and grime to bring your air filter back to factory efficiency.

K&N Power Kleen is a 32 oz trigger spray degreaser designed specifically for K&N oiled cotton air filters. It safely and effectively dissolves old oil and grime, restoring airflow and engine performance without voiding your filter’s warranty. Easy to rinse with water and residue-free, it ensures your filter performs like new, keeping your vehicle running at peak efficiency.

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Manufacturer	K&N Engineering
Brand	K&N
Model	99-0621
Item Weight	2.38 pounds
Product Dimensions	11.12 x 3.7 x 3.21 inches
Item model number	99-0621
Is Discontinued By Manufacturer	No
Manufacturer Part Number	99-0621
OEM Part Number	99-0621
Special Features	Residue Free
National Stock Number	6850-01-497-4553

K&N Air Filter Cleaner and Degreaser: Power Kleen; 32 Oz Trigger Spray; Restore Engine Air Filter Performance, 99-0621

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