Reviews are critical, we know this. Some sites like YELP discourage soliciting reviews. It is wrong. But when a customer says "thanks, you did a great job", asking that person to 'digitize' their review online isn't soliciting reviews. It's asking them to digitize a review already provided.
Training your customers, and their staff, to keep an ear open for these comments, and taking action to get the customer to leave the review online is critical. We do several things from Review Post cards to auto responders.
We encourage marketers like yourself to develop techniques and templates to send to your clients. This is critical to receive REAL and LOCAL reviews for clients.