Earlier today I discovered an an app called Get Plain Text that automatically strips out formatting when text is copied from a PDF or webpage etc before pasting to another location, such as a web page where it might mess with your results. Get Plain Text on the Mac App Store
You just install it and set your preferences, then forget it. This is free but there is an option to make a donation if you wish and I think this could potentially be a huge time saver. Copy pasting from word docs for example is notorious for causing problems with web pages. I often run text through text wrangler first, before pasting to a Blocs project but this should eliminate the need for that.