>> KEEP YOUR FUNNELS CLEAN <<
Depending on the diameter and length of a funnel, I have had to devise some creative means to protect them from dirt, dust, and debris.
Also, I have seperate funnels for coolant/anti-freeze; this keeps oil out of my coolant and anti-freeze out of everything else.
I store the smaller funnels in those neat red plastic Folgers cannisters; no one at our house will go near coffee, but the in-laws drink enough to float a battleship every ROOK night.
Larger diameter funnels and my big double-element MR-FUNNEL fit nicely in lidded five-gallon buckets.
I cap the pointy end and drop the cut-off bottom of a jug or bottle over the big end of those long pointy funnels, anything to keep the filth out.
I avoid those neat pleated accordian-style funnels, on account of all those little pleats just being hidey-holes for all manner of grit, grime, and dead mice.
In the bed of nearly every pick-up I look in, I see a filthy funnel rolling around in a pile of last years fertilizer, a spilled bag of HI-MAG minerals, several drill shavings, some pea-gravel, and hair from fourteen dogs.
When these guys need to prime an injector-pump or top off a newly-rebuilt transmission, they will grab that usually pleated funnel from the truck-bed, knock it against their boot-heel a couple times, poke it in wherever they are adding whatever, and pour away.