[nana77]

Just saying but better ask at a professional first, imho: compressed air also can help @Rumpelteazier (meaning that it might depend of the problem, won't it to get worse instead).
Sometimes I'd found the solution within more uses of bicarbonate and vinegar (sorry, I'm weird), that when bend do some chemical effect; specially on hairs it can melt those.

Ps: not to bother on advices, but be careful when mixing chemicals products, that also means to know of what materials the pipes are.