Hi,
The most reliable option is to avoid exposure to these substances. Also, it would help to use antihistamine or antilallergic medications.
What symptoms do you have? How old are you? Are you on any medications curently?
What has your doctor advised?
Keep us posted about how you are doing.
Regards.
Google "watercure" online. This talks about using natural ways to prevent allergies like the ones you're talking about.
Lila