Please help me to contact a customer with a letter.

Dear (Name/Company name)

Allow me to take this opportunity to be introduced to you with this letter. My name is (Name). I manage a company (Company Name) settled in (City).

We are a specialist medium sized company providing Property Maintenance & Facility Services. We have earn well established track record in this field.

We have previously been working as sub-contractor with your current cleaning company.

I am writing to you to enquire about establishing a networking relationship with you. We are interested to provide you a better cleaning service at more affordable price.

(Details of services company provide & price)

We are looking forward to your favourable consideration on this matter. Should you have any questions and/or concerns, please feel free to contact me directly.
Sincerely
(Name/Company Name)