Speaker cleaning and maintenance

Cleaning speakers... OMG, I didn’t think that was a thing. I have not cleaned a speaker in 50 years of owning high end audio.

Cover the whole speaker in foam, use Griot's Garage wash mitt, rinse with reverse-osmosis purified water and blow dry. No wait that's the car. Wash both sides with Walker Cleaning Solution, then Walker Enzyme, then two purified water rinses the last one vacuumed off with the, no wait that's records. Dang. Okay, okay got it now: soft brush furniture attachment on the vacuum cleaner! 

The reason I forgot is I only did it one time, years ago.

I'd try pinch roller rubber renue before any car crap.  But I'm not gonna.  
Audio NOT auto.

every easter i load my speakers in the bed of my pickup truck and run through a brushless car wash

make sure it is a brushless wash, you don't want swirls on the finish

Hot and dusty where I live.. Vacuum with a brush attachment. If I see surrounds getting too dry I’ll treat them. I only use Silicone or BR surrounds so silicone is the best treatment on the surround, not the binder (glue). I apply the silicone with a lent free rag. I have 50 year old BR surrounds and 75+ on cloth/wire surrounds. They will last another 75 years.. The suns UV are the killers..

I quit dong the car wash thing.. Every time I let them dry out... :-)

Regards