I found the best stand-alone product I ever got for my cat was a
FURminator (brand name de-shedding tool). You brush your cat with it an hour before bathing and then once the cat is
entirely dry and they're so clean for a really long time. It cuts way way back on allergies too. She likes to be brushed with it but not to sit still long enough for the whole job is the problem... so you have to hold her still after about 10-20 minutes to finish the job, but it's really easy for me compared to other strategies!
She stays clean for SO long once she's de-shedded, bathed, and de-shedded/brushed again a few hours later. The cat hair doesn't gather in the drain either it's a miracle! LOL!