If you cannot ignore them a Q-tip with a drop of MASS
might help if they are not soap.
There are some shower glass cleaners that remove
soap scum. Not the ones to clean grout with chlorine/ bleach!
Again. A drop on a Q-tip (cotton swab) and lightly
clean the blade.
If you find that it helps to lay the blade flat on something like a cutting
board to clean it you are likely pressing too hard. :D but it does help.
When done rinse and lightly oil the blade. Mineral oil is
a good choice and is inexpensive and easy to find.
Again a cotton swab (Q-tip) can be used to apply
the oil.