Our breeder instructions for bathing were "whenever" she needs it! So ... at first it was several times a week ... now about once a week. Since she is not allowed on the ground except for walking, we use the "sniff" test!
If she smells like a dog ... she's gonna get bathed!
BTW ... thanks, orinskye, for that brush link. The picture of the cat having a "bad hair day" was toooo funny!!
The brush sounds like a good idea!