रजकाः काष्ठफलकश्लक्ष्णशिलासु वस्त्राणि नेनिज्युः ॥ कZ_०४.१.१४ ॥
rajakāḥ kāṣṭhaphalakaślakṣṇaśilāsu vastrāṇi nenijyuḥ
Washermen shall wash garments on wooden boards or smooth stones (i.e., only on approved, non-damaging surfaces).
Technique: the state prescribes process standards to reduce damage and disputes in a common public service.