SLS

took a day off work today, got up and the sun is shining. ok the S is coming out. (has been locked in the garage for a month) roof down and give it some. after 25 or so miles i noticed some white marks on the dash, it seems like condensation under the glass, it gets worse at times and disappears at times. i go to the dealer and they will check miras. WTF is miras and more importantly what and why these marks?

AndyDoh

Dont worry about it I had this when I left my car for a while without using it & it just went away after a couple of days driving with the heaters on

Andy

steve_the_greek

Spooky ! Mine did this for the first time in 4 1/2 years this morning. I must admit to not having driven it for a month. The amount of condensation did seem to drop after an hours drive.

MLC-PM

I tend to only drive mine at the weekend, so I get condensation under the dashboard glass all the time - especially in the winter.

mikey k

IIRC - MIRAS - was a form of mortgage tax relief

Solution - drive it more with the roof down and the heater on !