Can this cover be washing in residential washing machine?
My first thoughts are "Sure, knock yourself out!" Seconds thoughts are "Is there a care label?" Third "Ask your missus (or your Mom)" Forth ...... perhaps there's a better section to ask the question? In short, I don't know! Hope this is of some assistance. Best!
I have a custom cover for my 348. It is made out of similar material as the OEM. I wash it in my washing machine at home on gentle and dry on delicate. No problems as of yet.
I have washed the OEM cover for my 550 in my home washing machine on cold with mild detergent. I then hang it up to air dry. The biggest problem is the size of the thing. It is probably the max size item I would put in my home washing machine. Also, you really should have a helper when you go to hang it up to dry so it doesn't drag on the ground.
You can use your washing machine at home, set knob on delicate and I would say let it dry in air rather than the machine dryer, will make it last longer.