May well be time to admit defeat and get someone in. Trying to sort out drains without decent PPE is not advised, you simply do not know what is lurking down there. I certainly wouldn't put my hand in without gauntlets on. To a certain degree you are safer so far as its your drain, dealing with someone elses drains, and there's no telling what could be in there - needles/glass/acid drain cleaners/anything.....