A third of drivers said their cars are so full of junk, there's no room for anyone to sit in the car except for them, according to new research. A survey of 2,000 American drivers found 31 per cent of cars are completely overwhelmed with random stuff. Likewise, 35 per cent of drivers don't know how often they should have their car washed. One in five (19 per cent) haven't cleaned their car within the past three months, and 10 per cent don't even remember the last time they cleaned their car. That isn't the only issue drivers face: 53 per cent of people surveyed have had a drink get spilled on the floor/upholstery, while 44 per cent have had their clothing get caught and ripped in the door. Meanwhile, 36 per cent said they've been burnt by hot seat belt clips in the summer and 59 per cent struggle with slick roads in the winter. These problems have required some unique solutions. Respondents have tried everything from keeping salt or kitty litter in the trunk in case they get stuck in the snow, driving with the front windows down halfway and back windows down all the way to keep the car ventilated in the summer, and using cruise control and stability control as needed, all in an effort to work around driving inconveniences.