Remove whole directories:

     mkdir -p /scratch/$USER/gfalFS/T3_CH_PSI
     mkdir -p /scratch/$USER/gfalFS/T2_CH_CSCS
     gfalFS -s /scratch/$USER/gfalFS/T3_CH_PSI srm://t3se01.psi.ch
     rm -rfv /scratch/$USER/gfalFS/T3_CH_PSI/pnfs/....whatyouwannaremove
     gfalFS_umount /scratch/$USER/gfalFS/T3_CH_PSI
     gfalFS_umount /scratch/$USER/gfalFS/T2_CH_CSCS

Tier3 path

    srm://t3se01.psi.ch:8443/srm/managerv2?SFN=/pnfs/psi.ch/cms/trivcat/store/user/thaarres/