It's a bit difficult to tell from your images, but the verbal description sounds like leaf miner damage.

If you want to try the non-pesticide route, you might try washing the plants with a mild soap. I put plastic wrap over the soil and then dip the entire plant upside down into the sink, full of soapy water and swoosh it around a bit. It will take a few dousings, but this eventually got rid of the problem for me.

Thanks!

Leaf miner was my first though too but it seems to be missing the characteristic "trails" through the leaf, that you find with leaf miners. Can you have leaf miners without trials?

Also the pot/plants are a bit to big to flip it upside and wash.

Any other advice?

Its a Bactreial Disease (happend to my plants too). Like tplanter said soap might work. Let your plants dry out ALOT! then when they wilt water w a nice compost tea that will really help. It is from too much watering/bad organic matter/bacteria in the soil. Look up enzyms you can buy that clean the plants roots and grow medium.

Yes, you can have leafminers but not trails.

The non-trailing types are called blotch leafminers. One big irregular spot. the layers of the leaf come apart easily.