Could be just a spider web, or may be mites. If mites, you should be able to see some using magnifying glass, even if tiny. There are usually enough of them to be able to see. And their webs are more connected - not sure how else to call it - rather than a solitary filaments. Spider mites will cause damage to leaves (small yellow or brownish spots), while regular spiders just spin their webs to catch their pray. Try a test: hold a piece of paper under the leaves and shake plant gently. Spider mites should fall on paper, and appear as small dots (like a finely ground pepper).

Do you mind if I ask why the 'regular reatment' by Azamax or neem oil (just wondering)? Are you having some serious pests problem?

I’ve noticed that the spider mite webs tend to be grainy or granular to the touch. Not smooth like regular spider webs.