Wow, sounds like a "sticky" problem.
What about dampening a cotton pad/soft wash cloth with warm water, and gently cleaning that area?
Also, i would use a greyhound comb with long hair kitties. (See pix of comb in previous posting - it is the metal looking comb.)
After cleaning the hair and skin, gently comb the hair out. i would be very careful. If you like you could dust a little powder (i use non-talc jojoba oil - made of mainly cornstarch and oats) with a tiny blusher brush.
When i first adopted Venus, she was shaved as well. i was very careful in handling that area when grooming her. Usually, i wiped clean that particular skin area very gently with a moistened cotton pad. i would not use a slicker brush around that area, just a greyhound comb.
Also, i would recommend a tiny pair of scissors with round ends (this is actually human nostril scissors.) i like the round ends, as they won't harm the kitties. i used this to remove the strings very slowly and carefully after about two weeks.
Don't know how much i helped, but here are the pix.