With all of Addy's "experiences" lately, I decided we needed a highchair cover that could be scrubbed clean without the use of a washing machine. 1 vinyl table cloth and a couple of hours later and we now have a spare cover for ground zero. (Which bring up the philosophical question: is it really a spare if it's now the primary one?)
Unfortunately, we were able to prove its cleanability this evening when Addy experienced yogurt. (Yogurt was part of item 4 of the great "Un-Yack Addy Project." It is now part of the "Things To Only Feed Addy If Syrup Of Ipecac Is Needed And Not Available" list.) The seat cover proved quite durably cleanable.