Why exchange it? 
Keep it in euros for your next trip to Euroland; unless, of course, your holidays take you to more exotic places.
Best .
Roger
Not going to happen unless I leave the missus with her two cats and two dogs.
Been using the bar of soap instead of defoamer. It works better in my opinion.
How long does the bar of soap last?
Overall wouldn't a good handful of table salt do the same and be cheaper?
Depends on how hot your recovery water is, but it does seem to be lasting. The thing is, you just put it in and forget about it, and dont have lug about defoamer. In terms of cost it doesn't have to Moulton Brown!
Turney where in the tank do you put the soap?
In the recovery tank. The added advantage on my machine is that it slows down the deluge when emptying and pops out itself to remind you to put another in!
Cheap liquid soap, couple of pumps into recovery tank works great. Cheapest defoamer you can get.
Thick brown parcel tape is great for furniture sliding.
I shall be getting some tape then! Thanks