tilestache-clean: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/tilestache-clean - from package: tilestache

You may install the required package with command apt-get install {package}

Error in other languages:
tilestache-clean: bevel nie gevind nie
tilestache-clean: comandă negăsită
tilestache-clean: comando não encontrado
tilestache-clean: commande introuvable
tilestache-clean: command not found
tilestache-clean: käsku ei ole
tilestache-clean: không tìm thấy lệnh
tilestache-clean: komanda nerasta
tilestache-clean: Kommando nicht gefunden.
tilestache-clean: kommandot finns inte
tilestache-clean: komut yok
tilestache-clean: nie znaleziono polecenia
tilestache-clean: níor aimsíodh an t-ordú
tilestache-clean: no se encontró la orden
tilestache-clean: no s'ha trobat l'ordre
tilestache-clean: opdracht niet gevonden
tilestache-clean: parancs nem található
tilestache-clean: perintah tidak ditemukan
tilestache-clean: príkaz nenájdený
tilestache-clean: příkaz nenalezen
tilestache-clean: команда не найдена
tilestache-clean: командата не е открита
tilestache-clean: 命令找不到
tilestache-clean: コマンドが見つかりません