Get a quality breathable outdoor cover. My cover was from Specialised Car Covers and is an indoor tailored one, buit they do make outdoor ones as well. Not cheap, mine was £200 8 years ago but I use mine for summer only. My car is in a CarCoon now. Set of steelies on, brick either side of one rear wheel, no handbrake on, rear windows open for ventilation. Forget about her for best part of 6 months !!!