WRONG! A SAVED MITE EGG IS A MITE WAITING TO HATCH! Any and everything in the grow must be removed from the grow.
Then it must be cleaned compleatly inside and out I.E fan vents, fan blades, everything you intend to return to the grow erea.
If you are using mylar, It's trash now. Spider Mites that don't have anything to eat, breed Imediatly and lay eggs on anything they can to insure future generations. This rapid reproduction with nothing to eat can go on indefinatly, until there is food to thrive for a season. So trashit!!!!!!!
Floors must be re-cleaned over and over with bleach solurion, spray bleach solution on frameing in partially finished basements . You have to use the down time to rid yourself of these issues.
You may need to re-paint your walls white this is yet another reason why white walls are the prefered reflective material, and I say one reason, as there are many more.
Sprays and remedies are the bandaid that may, or may not get you through your bloom . If it is early on in a grow I've found it not worth the effort to fight them for 3 to 4 months. I abandon the grow solve the problem and start again.
This is a personal choice, and you will form your own after you have been through this.
There are alternitives to get ya through. Caliclean posted under bugs, first entry, works well for control it must be re-applied as eggs hatch, get rid of the bodies ... and I would recomend giving it a try. Your next defence and depending on the infestation, your thumb and forfinger, to squish the mites and eggs, works as well, don't ignore them! Spider mite predators are another option. Lady bugs don't eat spider mites so don't bother. The preditor mites that are obtainable are: Phytoseilus persimilis, It thrives in 55-105deg F at 60-90% h. Neoseiulus calfornicus 55-90 deg F. 60-90% H. Mesoseilulus longipes 55_105 deF. 45-90% H. These can be purchased through Igrowhydro . com on line. shipped overnight. They are pre-mixed with these , To insure colinization. they are fairlly expensive 1500 for around $100. (One preditor mites can kill and controll 5 spiders or 10 eggs a day) They breed and multiply faster than spidermites, they disappear when there is no longer a food source. These take a week or two to get a foot hold and start controling the issue. If heavilly infested destroy it and start over or try neem oil( Not prefered) or cali clean made of habeneros in your kitchen.(more prefered). You may be able to win this battle but its tough. Control is really all you have to look forward to if you don't stop and irradicate.