We have pets, so we got one of the small portable pet cleaners that basically works like one of the big cleaners that sprays the cleaner then sucks it up, and it has a tank that all the liquid goes in, wet powder went in there, and was disposed of.
So when i first spilled some powder on carpet, i used that, since then i rebuilt the table that the press sets on to include a wood tray that traps the powder and has a chute for pouring it back into a container, whole thing clamps down to the table with the press screwed down to the tray, and calk around it.
and of course, since i did all that, i haven't spilled any.