At home mostly its not possible  to remove the plaque as it adheres to the quite firmly.u need to do full mouth scaling and polishing which will help remove all the yellow stains. May also require teeth whitening....

Hello, yellow teeth could be because of deposits on teeth surface or food lodged in between teeth. Visit a dentist and get your scaling and polishing done. Brush your teeth twice daily, night brushing is very important. Floss regularly. Rinse after every meal. Visit dentist every 6 months.

May I know when was the last you had been to a dentist?  I can understand you have a bit knowledge about dental health when you used the word plaque. At home, the only way to prevent yellow teeth and plaque removal would be maintaining a good oral hygiene with twice daily brushing with an ultrasoft bristle tooth brush with a proper modified bass method of brushing. I would advise flossing only when there is food lodgement in between the teeth rather than flossing all the time as not everyone knows proper way of flossing and end up hurting their gums. Reason for yellow stains varies from tea, coffee or colorful eating habits, so whenever you have such food items make sure at least you gargle your mouth with water. Plaque is a dark brown-to-Black deposit formed when there is accumulation of food debris with bacteria and a person is either unable to cleanse some areas of the tooth surface due to crowding or difficulty with brushing, which needs to be removed by professional dentist or hygienist. For further suggestions and proper health care, please visit a dentist

Not possible to remove stains at home. Get  your teeth professionally cleaned.

Yellow teeth occur as a result of staining from food and drinks over time. Plaque accumulation also does occur over time. While plaque removal can be carried out to an extent at home with proper brushing and flossing, a thorough professional clean and polish by a dentist is recommended at least twice yearly.