That phenomenon is very real in my personal case. Unfortunately the ideas go away by the time i get hold of pen and paper after the shower. Possible solutions to this are welcome.
I've been in this situation. For better or worse, I have a Google smart speaker outside of my shower. On more than one occasion, I have asked Google to remind me to do something the following day and have provided enough detail for me to recollect the thoughts I had in the shower.
https://www.amazon.com/Aqua-Notes-Water-Proof-Note/dp/B01AS5...
Are you able to share your thoughts on how well it worked? I don't trust Amazon reviews.