The cliffs themselves are banted back in order to make them safe from rock falls and so forth, but they, they do still suffer from weathering attack by rain, by frost, and the combination of salt from spray and frost is quite damaging, so that anybody who walks along the undercliff knows that in winter, for example , you tend to get a sludge of erm white erm finely divided wet chalk which sledges off erm cliff, particularly those people in recent years who've walked behind the marina, where it no longer gets washed off by the high tide  erm where Brighton Corporation have to keep trying to remove it.