Every salesperson knows that there are clients, and there are clients. Some customers are lucrative, they pay on time, they communicate with decency and they generally fit into your system. However, other clients are trouble-makers, they waste your company's time with their demands and they refuse to pay. The dream of every salesperson is to have a portfolio consisting only of quality customers – one of the reasons being is that the less time you need to spend on handling problematic clients the more time you have to acquire new ones. Here are four steps to getting a clientele that is lucrative and quality in the long term.