Essential to have draught moving between car and covering, and to have the windows open a bit. Helps avoid condensation. Also the axle stands standing in water, ie a bucket or something similar to avoid mice getting up them and into the car. They got into my pals car( audi) through the drainage box at the bottom of the windscreen, ate their way via tubes into his air conditioned glove compartment, built an extensive nest there and then got into the car interior, and for some reason ate the leather off the front corners of his two front seats. They like rubber, plastic, spongy stuff, plastic on wires, hoses.........
