Use a brush on the carpets and brush it into one place. I find brushing carpets/interiors a lot easier than using a vacuum. Once this has been done, nip down your local garage/carwash and use their vacuum there. If you have brushed everything into one place you should only be there 30 seconds. Tip, use a medium bristle brush. Too hard and you could rip up, too soft and it won't do anything. I use one that cost me about 20p from Wilkinsons.