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Drano and a few other brands have a foaming pipe cleaner that works amazingly well. You pour a solid, powdery substance down the drain, pour a cup or two of water after it, and the powder starts foaming down the drain. It stays in the drain and really does a good job of cleaning it.
The other thing is to make sure you have a good enough strainer to filter out hair and such. You would be shocked to find out how much hair falls out in the shower, especially if anyone who uses it has long hair. If you do not have a good strainer, it will just go down and join up with the old clog. A week is not too uncommon for the hair to clog up, especially if more than one person uses the shower.