Warsh is widespread in the western US. I have heard it in the UK- perhaps it came from there originally. Anyone in the UK know if it comes from one region or another? I have been told it is Irish.

Asphalt- What is the source of ash-felt? I think this was asked before, but I can't remember if an answer was found. In Canada, very few people correctly pronounce it as-falt.
Just remember the ie rule- i before e except after c and in certain weird words.