how to get rid of fleas

We have a flea problem in our basement for about 3 months. This is the 2nd time we bombed the basement. We have no problem in the house. Only the basement. We do have a cat, but she is treated and we no longer allow her in the basement. We had an old well in the basement, and left it open for about 1 month to repair cracks because it leaked. But this home has been hooked up to city water for years. We have been buying HOT SHOT spray and 2 kinds of bombs-hot shot and raid. Shouldn’t this been good enough by this time?

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I was wondering how to get rid of fleas, eggs, et al, from behind the master bathtub.  My cats have access to this area, but I really do not (6 in. x 6 in square max.).  I was thinking of putting a heated flea trap since there is electric. Any other thoughts?  The access to this area is floor level through the master bathroom closet and is almost impossible to get to.

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