Picked up my Bonatti Grey 4.2 SC today and loving every second of being in the cockpit..but i have a really newbie question....would using pre-icer have any negative effects on the heated front windscreen...i know its getting warmer now in the UK but was just wondering if any of you knowledgeable people know. There's nothing in the manual that says you cant use specific things. If it doesnt scare you it isnt heavy enough

Do you mean the liquid/aerosol stuff you can spray on the outside of the glass?

If so, then there is absolutely no issue using it before or during use of the heated windscreen - have done both on a couple of mornngs where the ice is particularly thick. Timed climate is best though

^^^ Agree with what Supacat says
Shouldn't cause any problems, although I tend to just start the car a few minutes early and let the screen defrost itself. Never really been a fan of de-icers. ON THE WAY: BMW F21 M140i
MERCEDES GL350 - Metallic Navy Blue w/Grey interior

GOING: BMW F31 335D MSport+ xDrive Touring
GONE: Land Rover Discovery 4 HSE - Stornaway Grey w/Black Interior (wish we'd kept it )
GONE: BMW F10 520D MSport - Carbon Black
GONE:MY12 RRS SDV6 HSE Sumatra/Ivory/Grand Black Privacy glass

Awesome thanks for the replies!  If it doesnt scare you it isnt heavy enough