Android will become heavy and get some errors iphone, send sms, anf having too much cache stored. Cache will created when application run or executed, using the d of course browsing.
With history eraser for android, you can easily clear history and other cache from your applications. But, you must be careful when delete the cache and history, look carefully which one you have to delete and which ones are not.
You can find history eraser in android market.
Or you can follow this link.