If you wish to clean Them, the traditional way is to use cotton wool dipped in a tilak/lemon juice mixture and rub, alternatively another natural cleaner is tamarind.
2: Dressing your deities
As you see from the illustration, Their dresses fan up at the back. If you want to get this effect, then pin the dresses closed along their open side, tight enough to get them to stand up at the back.
The peacock feathers and/or plumes are fitted to the back of the crowns with bluetack. Crowns (called "mukuts") in general are not very easy to fit, and a tab of bluetack on the Deities' forehead keeps the crowns in place much easier. Beeswax is a better adhesive to use.
While Srila Prabhupada said They can even be kept in a cabinet with dolls and the family keeping Them will benefit, the booklet is intended for those who want to worship Them. So it is best to find a suitable place for Them, perhaps make a small altar, and leave room for offering a tray of food.
3: Decorating your deities
Some householders dress and decorate their Gaura-Nitai dieties daily, some do it on ekadasi days, and some "maybe" on major festivals. Whatever your standard, adopt a schedule you are happy to maintain. If you have a garden, you can use it to grow flowers for decoration and offering. You can find out major festival days and ekadasis (when devotees fast from beans and grains) from any ISKCON centre.
