Headlight wipers blades (surprisingly) are a hard-to-find item at most auto stores in the US. They have to be ordered or purchased from a dealer - either way they come at a premium price. This instructable details the process of replacing the headlight wiper blades for a 2001 Volvo V70 using an old "standard sized" wiper blade assembly. Just the same, one could purchase a generic wiper blade assembly (or blade refill) from an auto store and do the job for very cheap.
To remove the wiper blade assembly on a V70, swing out the wiper arm, hold on to the wiper arm and pull back on the blade (from the perspective looking at the wiping tip of the wiper blade).
Step 1: Remove wiper blade from assembly
To remove the blade, take a pair of pliers and slightly bend one side of each retaining clip on the assembly. It should be bent just enough to slide the old blade out. Careful not to damage the clip or bend it too far, the bracket will be reused!