Do you mean a carpet/mat type of "rug" or do you mean a blanket type of "rug"? I'm trying to picture washing a mat.

Are you talking about one of those polypropylene doormats that are so popular? How did you wash it? I think they can just be hosed off to clean them. Or sprayed with detergent and rinsed with a hose. Did you do it differently? Are you sure it was a poly rug and not jute?

Sorry, I think in the US you call a "rug" what we in Australia would call a carpet. What I am talking about is a large rug or mat about 10 ft by 6 ft that goes on top of the carpet. I washed it by putting it on the patio then using a hose and washing liquid then hosing down to rinse.I then draped it over the washing line ( hills hoist type) until most of the excess water had dropped out then laid flat on the lawn to dry off. It dried quite quickly and seemed fine until I brought it in and replaced it on the living room floor. Then it became apparent that it was no longer "square" - it seemed to be sort of warped or buckled. The texture, colours etc seemed fine though. It is a fairly common type rug and I am pretty sure it is acrylic or polypropylene type fibre that is a cheap version of the proper wool oriental type rugs. I can re-stretch it back to shape by hand to get out the buckles (which I do a hundred times a day because it annoys me so but then a little later it creeps back to the original buckles. I have concrete base floors throughout - if I had wooden floorboards under the carpet I would be tempted to just nail the jolly thing down !