kālena snāna-śaucābhyāṁ
saṁskārais tapasejyayā
śudhyanti dānaiḥ santuṣṭyā
dravyāṇy ātmātma-vidyayā
kālena - by due course of time (the land and other material things become purified); snāna-śaucābhyām - by bathing (the body becomes purified) and by cleansing (unclean things become purified); saṁskāraiḥ - by purificatory processes (birth becomes purified); tapasā - by austerity (the senses become purified); ijyayā - by worship (the brāhmaṇas become purified); śudhyanti - become purified; dānaiḥ - by charity (wealth becomes purified); santuṣṭyā - by satisfaction (the mind becomes purified); dravyāṇi - all material possessions, such as cows, land and gold; ātmā - the soul (becomes purified); ātma-vidyayā - by self-realization.
These are śāstric injunctions concerning how one can purify everything according to Vedic civilization. Unless purified, anything we use will infect us with contamination. In India five thousand years ago, even in the villages such as that of Nanda Mahārāja, people knew know to purify things, and thus they enjoyed even material life without contamination.