Don't use muriatic acid, ever, on a pump. With acids an plastics the concern is not pH it is electronegativity, a strong acid will form hydrogen bonds with plastic and cause it to swell, while it is imperceptible the change in tolerances will create vicious cycle of tighter tolerances, more heat and friction, more calcium build up, more acid soaks and so on, the plastics mass can be increased by as much as 15% by exposure to strong acids, stick to mild organic acids. You can use bleach, but I would stay to not more than 1 part bleach 20 parts water. For the non electrical parts and non magnetic parts, like the front housing and clamps, you can use your dishwasher but follow the recommendations of the dishwasher manufacturer for where you would place plastic dishes and cups, usually the middle rack or use a low heat or drip dry setting. Keep in mind that heat will destroy the magnets, they generally will start to demagnetize above 120F.
