I have just acquired a second hand cameleon and so want to give it a very good wash! it is not entirely clear to me which bits can be machine washed and which can't. Specifically, can you machine wash the seat bit, the part of it in the base fabric colour rather than the other colour, the part with the semi-solid ridged back support bit? It seems like the solid parts are too solid to be washed but I can't work out how to get them out. Any advice much appreciated!!