The amount of soap is sufficient for several full washes. I'm definitely going to be a regular soap shopper! To explain its durability, soap must be diluted with water. It only takes a small portion to get the right amount of water soap. However, the brush that comes with it is terrible. It is too hard. It ripped some of the stitching on my 10th gen Honda Civic and ripped some overlapping fabric materials. Using it aside from that worked great. Don't even think about using the included brush on the soft fabrics found in many car trunks.
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