I spray the fabric and carpets with 1001 carpet/upholstery cleaner, agitate it with a drill brush, and then bissell them with just hot water. Great results
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The problem I've found with using a cleaner chemical in the bissell tank is it generates a lot of foam, which can p1ss out of the bottom of the machine. Or maybe I just put too much chemical in
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Keep the filter clear as well (blocks up super fast) otherwise that also causes leaks out of the bottom.