diff --git a/hooks/ebuild_postinst_post/clean_pbin.bash b/hooks/ebuild_postinst_post/clean_pbin.bash
new file mode 100644
index 0000000..5ea7ec9
--- /dev/null
+++ b/hooks/ebuild_postinst_post/clean_pbin.bash
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+# set this only
+reponame="hasufell-binhost"
+
+
+if [[ ${CAVE_PERFORM_CMDLINE_destination} == ${reponame} ]] ; then
+	shopt -s nullglob
+
+	repo="$(${CAVE} print-repository-metadata --format '%v' --raw-name location ${reponame})"
+	bins="$(${CAVE} print-repository-metadata --format '%v' --raw-name distdir ${reponame})"
+
+	good_files=(
+	    $(for pkg in "${repo}/packages/${CATEGORY}/${PN}/"*".pbin-1+exheres-0" ; do . "${pkg}" ; basename "${BINARY_URI}" ; done)
+	)
+
+	for file in "${bins}"/${reponame}--${CATEGORY}--${PN}-*.tar.bz2 ; do
+	    file=${file##*/}
+	    if ! echo "${good_files[@]}" | grep -q "${file}" ; then
+		rm -vf "${bins}/${file}"
+	    fi
+	done
+fi
+