Every one I've tried over the years has failed within days or a week, all well known or highly rated ones, deer seem to feel they're a flavor enhancer, lol..

I've been eliminating stuff deer like to eat as a result, but still have a few areas of plants that are supposed to be resistant to browsing, but they still get hit...

I've about given up but found a different brand with different ingredients and figured I'd try it...well so far it's been working over a month, even after some heavy rains.... The name is Trico deer and elk repellant, one of the ingredients is sheep fat, the claim is months of protection, so far so good..
So if anyone has a need for a repellant that works, it's worth a try....

Thanks. I've tried a bunch of different ones with the same results as you.

We use the Trico-Pro on our farm/nursery. It does a reasonably good job on things that deer like to eat. It will NOT keep bucks from rubbing on trees though.

https://wirelessdeerfence.com/

Have some guys using this product with good luck, complaint is poles not heavy duty enough.
Push the stake into the plants they are eating.

Use a mannequin that looks like 160user.