Somehow I missed this earlier post & I would say yes, mites can hide in that gauge too so you should be treating it either chemically or time/temperature methods.
Not sure your plastic plants will be safe either with just a wash off...I think most ppl toss fake plants, as there's too many crevices & it's risky, but if you bag them up
tightly & treat with Frontline or whatever, & leave them out for long enough (over 30 days+)??? Take your chances, I guess?