Agree those veggie clips are overpriced, but rubberbanding nori or live macroalgae to rock and drop in tank daily (and getting wet) isn't my idea of fun.
On the plus side, over time I forget how much paid for magnet and clip... I've got two to spread the algae eating aggression out among fish (but rock with rubber band is $0, and two rocks with two rubber bands still $0 ... but I really like using my clips)
Occasionally I clean my clips same way I clean my pumps - quick soak in citric acid then toothbrush scrub. Usually in same water as I wouldn't mix up citric acid just to clean a clip or algae scrubber magnet (I leave those IN tank so they get coated)
Tangs will tear that nori up so I found multiple foldings helps slow that down (a bit... as they grow they get smarter and stronger). Weirdly macroalgae they TEND to nip from the ends inwards so they don't create as much of a mess as if they started on the clip edge which would free the branch of Ogo to float everywhere. I like how if I'm careful to have all the Ogo branches IN the clip, the clip keeps them held