I want to clean ny air con system through , any ideas on which one to use ?

I see one on ebay that has a hose that you put through your vents and it foams up and cleans through , any one got any suggestions .

That sounds messy.

Try go for an aerosol bomb, normally set it off in the passenger footwell with the pollen filter removed and leave it doors closed on recirc and blower speed 2

do you have to cover the seats first?