To make pump soap last longer, you can also pour half of it into the last bottle & top both off with water... it makes it easier to distribute it for washing (less slick/ slimy).
If you don't have a massage gun to clean filters, you can just tap it on the edge of the container. I actually hold it inside the trash bag/bin and tap it on the side (of a cabinet)... then I don't have a container to clean.