what it does is that everytime you press a key (in my case its scroll up) it clears all the bullet holes , grenade marks , blood marks , etc from the map and it really helps in certain places where enemies can kinda blend in with their bloody or damaged background (the example in the thumbnail is long doors)
it's a simple spell but quite unbreakable
here's my version:
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bind mwheelup "r_cleardecals"
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just replace "mwheelup" with any key and you're good to go

i like to use right handed viewmodel when i'm peeking from right to left and vice versa so the viewmodel doesn't obscure vision
here's the bonus bind as promised:
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bind mouse4 "toggle cl_righthand 0 1"
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i hope you use and enjoy these binds
peace