SEO for Cleaning Products Website

We're an Australian Digital Marketing agency who have setup a website for a Cleaning Products company. We believe the site is well optimised and but rankings haven't improved beyond page 3 of Google. Due possibly to competition, or possibly because of lack of inbound links. We're looking for an outside party to assist with boosting rankings. We are open to all ideas and tactics. But work must be ethical, and long term sustainable. At the moment this is one client, but if the outsourced party can prove him or herself, we'll have more clients to throw your way (using Freelancer as the escrow and mediator). Thanks for responding. I will endeavour to respond to all responses/questions/bids. R.