Try a product called Total by Auto Finesse. It worked treat for me.

Sutty.

 

Upholstery mouse. Poundland. Doesn't make the seat too wet either.

 

Agree with above use a spay mouse with clean mf so you can remove just the mark and not soak the seat.

 

My fiat panda has easy stain seats (like a fabia vrs). I use meg apc diluted on the panda, on the vrs I used to have I used autoglym interior shampoo. I have just protected my panda seats with gtechniq l1 smart fabric to see if this stops it.

 

If you plan on doing the whole seat use an apc but unless you do the whole seat you will be struggling with more staining. Using a foam you will be removing the water stain without inducing more water marks, from over wetting fabric. Keep it simple same as bodywork use least aggressive and easiest methord first.

 

Lotus evora leather

Would you use consider 303 leather protective (or anything else) to prevent water spots in future ?
As it's a roadster it will be an occupational hazard with a manual not automatic top

If driven it's always roof down

 

Autoglym interior shampoo is also good.:thumb:

 

Good old Turtle wax interior cleaner with built in brush.
It sorts them water stains easily.
https://www.carparts4less.co.uk/p/t...uk/p/turtlewax-interior-1-multi-purpose-cleaner-stain-remover-400ml-PRR.TW51791
This and Super Resin Polish are the only 2 old school products that you will always find on my shelf. Wouldn't be without a can. Really usefull.

 

This video contains techniques and info you may find useful. The video is about cleaning water stained seats