The substances mentioned in the home remedies (hydrogen peroxide, lemon juice, vinegar or capsacin) on the web page you reported can easily damage the nasal mucosa if the vapors are inhaled often. As for the over-the-counter products used for treating sinusitis, you might want to see if it is FDA approved in USA or approved by a parallel reference organization in another country. This would give the product a lot of credit, since the approvals are given based on scientific researches and studies.
If you are allergic to certain of the ingredients, you should avoid using them, because many of the over-the-counter products use various herbs as ingredients.
In the end, you might want to consult a professional healthcare provider about any specific over-the-counter product. You do not have to visit a doctor always. A pharmacist can help you a lot about the ingredients and the side-effects of a specific over-the-counter product.