Spraying alcohol on your nearly finished plant(s)? Um…alcohol is an excellent solvent for stripping triches from plant material. Spraying it on your plants will melt your trichomes almost instantly.
Edit: Re-reads your post… If you intend to spray your EMPTY tent and not your plants, carry on!
You may have just had a regular spider visiting and eating pests. I encourage them here. Only ones that I see are those jumping spiders but they are effective! I’ve seen a small wed a time or two but they don’t build webs much.
If it’s webbing and that looks like webbing. I’d say it’s either spider mites or spider or caterpillar. Not sure what else makes silk.
But like others said I could def see it being some trichs that touched and stretched like pizza cheese
outa likes atm, i get fibers in my grows, its cotton from the gloves i have to wear to protect my grafts and some weird sensory overload thing. Not to concerned, I am for the most part the principal destroyer by fire of the med i grow