Shelly,
Unless you have cut an extremely large amount of of lumber with those 4 or 5 blades in the last year, your problem is more likely a build up of Pine Tar and Pitch.
There have been several methods of cleaning discussed here on the LJs Site and you can review a few and try some of these home brew cleaners to see if that may put your blades back in service.
http://lumberjocks.com/topics/9382
http://lumberjocks.com/topics/12462
http://lumberjocks.com/topics/2380
http://lumberjocks.com/topics/1190
http://lumberjocks.com/thewoodwhisperer/blog/31370
http://lumberjocks.com/KBC/blog/6822
Chances are you have one or more of these cleaning products sitting on a shelf at home.
Give it a shot and just maybe they will respond to cleaning rather than resharpening them.
Work Safely and have Fun. – Grandpa Len.
-- Mother Nature should be proud of what you've done with her tree. - Len ...just north of a stone's throw from the oHIo, river that is, in So. Indiana.
