As expected, there are certain parts of protein skimmer that must be cleaned every few days, whereas some sections only require a good scrub periodically. The collection cup of a protein skimmer, for example, requires a thorough clean around twice a week – and even more cleaning is recommended for tanks that produce excessive amounts of waste. You really don't want your cup to overflow! There is no sadder sight than all its collected waste overflowing straight back into your tank.
Cleaning the skimmer neck pump monthly is enough to keep most skimmers functioning well. However, just remember: the more you clean your protein skimmer, the longer your aquarium protein skimmer will last!