Recently I went for a ride, and it was a very muddy one. I blatantly misjudged the depth of a puddle and submerged half of my bike (and myself) in muddy water, including the chain and front/rear disk brakes.
The brakes started squealing and the chain started "sticking" to the front gear, causing the the pedals to seize up.
I cleaned the bike as best as I could and left it in the garage for about a week, after that I took out the brake pads, cleaned them with isopropyl alcohol and did the same with the disks.
The chain seemed to have rusted a bit, so I cleaned it with a wire brush sprayed WD-40 on it (and I know that might have been an error).
Now all the noise stopped, but I feel like I can't brake with the same force as before, and I feel like I messed up something.
Should I change the brake pads & chain? Any other steps I need to take?
If that happens again, what are the correct steps to take?
The bike is a Whistle B-RACE a7.1 E-bike
Here's an illustration for the stickage problem: