Dhamma objects means things to do with Dhamma.
1. Buddha image is Dhamma sight.
2.Chanting and dhamma talks are Dhamma sound.
3. Incense for the Buddha image is Dhamma smell.
4. Food offered to the Buddha statue, or food offered by others are good Dhamma taste.
5. Sitting cushion, robes or yogi clothes  is Dhamma touch.
when our minds come to contact with Dhamma objects, so our minds are more attune to Dhamma.This will reduce the attraction to sensual objects.

Whatever meditation that you take, whether samatha or vipassana, try to build some level of concentration until you can gain some calm and peacefulness. this will let your mind be free from kilesa/defilements fora short time.

Cittanupassana, contemplation of the mind?
Have you checked your own mind today?
Ask yourself?
1. What make you happy?
2. What make you sad?
3. Do you need good happy sensual objects to have a happy mind?
4. Can you renounce these good objects to have a happy mind?
5. How to renounce the sensual objects to be happy?

What are these sensual objects? These are good sight, pleasant sound, fragrance, good food and drink, and sweet and good thoughts.

6. There are few methods to renounce the sensual objects.
A. Try to see the impermanence of them.
B. substitute them with Dhamma objects.