Bless you! I believe you are big hearted and there are resources in your community that you might connect with.
First - I would look to the churches in your community and I recommend Presbyterian because of their structure. You will need to be ready to present your biz to their church community and/or "Presbyterian Women" as they often will give support and small grants. Ask their Youth Director if they would help raise funds by doing a car wash event to raise fund for your cause. This event would also allow you to give car owners a flyer about your biz and its outreach. Call their offices and speak with their Church Secretary/Admin. to ask for direction.
Second - Next try any senior citizen organizations and local Social Services Agencies in your community, they may utilize your services and provide small grants.
Third - "You need to be able to recieve, if you truly want to give." God doesn`t want his people to starve he`s given you an angel of an idea and wants you to succeed. God is creativity and supports creativity thru his expression of us. You just need to ask...go girl! God speed! -kidz