I'm still looking for the Tibetan way or basically the right way that it should done.Any links?
I doubt that there is one standard way and believe that different places have different methods, so what I am sharing below is what have been taught to me at one Gelugpa gompa that I have volunteering on a weekly basis to assist in gompa cleaning and tidying up:
a. 3 Prostrations to the Triple Gem (optional offering of incense/candles)
b. Respectful & attentive attitude/mindfulness when cleaning.
c. Optionally, one can recite prayers/mantras silently if one wishes when one does the cleaning and avoid unnecessary chatter. So far, what I recite silently when I am there is the Lama Tsongkhapa's Migtsegma or others.
d. For cleaning of altars and statues, there's segregation of wiping cloth/brush/duster used for different purposes for altars, statues, ritual items, offering bowls and etc.
i. For wet wiping, the cloth is made wet and then squeeze dry for a dry wipe effect
ii. For dry wiping, its either dusting with a special static duster or a dry/fine cloth
As for statues and Dharma implements, it depends on the type of it.
Those pasted with gold leaf or painted with gold/special paint, especially the face and hands or even chest areas are given light dusting whilst the other areas that are less precarious can be wiped with a well squeezed wet cloth and then with a dry one or just continue the dusting on other areas as well. Since the big thangkas are wrapped in clear plastic, its just wiping the plastic cover and the bottom handle.
So far, no bathing is needed or done.
For the big statues that are 7ft and 10ft, a 'cherry picker' (a special machine to elevate one to the top and height of the statue) is used and the similar processes are used for high cleaning.
f. At the end of cleaning, transference of merits or dedication prayers are recited.