1% of glue left on the hair or scalp can result in 10% less adhesion the next time you attach.
Therefore putting in the time to get the scalp & base as clean as possible can really pay off.
Thats why people have built up their own cleaning & maintenance regimes.
But just because some do it, doesn't mean you have to.
You won't really know what is necessary until you start wearing.
Its folly to be prepared for EVERY eventuality & issue, because its very likely you won't experience half of the ones you read about.
It will all depend upon what glue you use, what your skin chemistry is, how you care for your hair on a daily basis and what activities your pursue.
You also don't need to invest in specialist hair replacement products for everything.
Normal 'off-the-shelf' products for things like exfoliator are perfectly fine.