what material are they made of? I wash my (synthetic) fleece pads/girths and square pads in the washer with normal detergent but don't dry them. I wash my sheepskin stuff with Pepede or Melp (special leather wash) on the gentle cycle and of course, don't dry them.
If the saddle pad and girth cover are synthetic then throwing them in the wash will be no problem. I would use a lighter detergant so you are sure all the soap was rinsed out of it and won't cause a skin irritation when your horse sweats aginst it.
If the tack is lambs wool or real fleece there are a number of products on the market that are designed to clean but leave the fibers with thier natural qualities. Lether Therapy Laundry Solution is one and Auskin Woolwash is another that I highly recomand.
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.