an electrophotographic photoreceptor and a cleaning method of the support therefor are disclosed . the element of si and na remaining on the support surface , evaluated in terms of esca , has the following relation with a major element constituting the support ; 0 & lt ;/ xs - si / xb ]≦ 0 . 5 0 & lt ;/ xs - na / xb ]≦ 0 . 3 , wherein si : esca measurement of a support surface after cleaning na : esca measurement of a support surface after cleaning si : esca measurement of a support bulk na : esca measurement of a support bulk xs : esca measurement of a major element constituting a support xb : esca measurement of a major element constituting a support .