Sorry I just saw your links and relized to told us exactly what they were lol!
Putting them in the washer would be fine. I would put the girth into a pillow case and tie it shut or use a scrunchie (hair tie) to close the bag so the buckles don't scratch your washing machine.
Eqyss makes an awesome Micro Tek Anti-Microbial Wrap and Blanket wash that you can put right into your machine at home and reinses out super clean. Plus you get all the benafit of removing any bactieria or fungus in the process.
I also would not recomend puting eiher the pad or the girth in the dryer or in direct sun becauset this may cause the stitching to shrink.