1. Be transparent about your company’s values and objectives. This includes making sure your website, emails, and other communication methods are clear and honest about what you do and why you do it. Don’t be afraid to show potential customers who you truly are as a business, as this will help foster a sense of trust and understanding between both parties.

2. Communicate clearly and frequently with your customers. Keep them updated on the progress of their project or purchase, answer any questions they may have in a timely fashion, and offer updates on new products or services regularly. Making sure your customers feel heard is key when it comes to building trust with them.

3. Respect customer privacy by only collecting information that is necessary for providing them with the service they need from you. Show respect for their data by never sharing it without permission and setting up secure encryption systems where possible.

4. Use authentic content in all forms of promotion including website copywriting, social media posts, email campaigns, ads etc., so that customers know who they’re dealing with when engaging with your brand online or offline.  

5. Allow for feedback from customers regarding their experience working with you through surveys or reviews on third-party sites like Yelp or Trustpilot – this will demonstrate an openness to receive feedback that can help you improve your service offerings over time while increasing customer confidence in your brand as well!

6. Display customer testimonials prominently so that potential customers can read these success stories before making a decision about doing business with you – this is especially effective if those testimonials come from respected industry figures!

7. Make sure there is consistency across all platforms – whether it’s branding colours or logos used online or physical materials handed out at events like brochures & flyers – having uniformity throughout helps give off an air of professionalism which increases customer confidence in the services/products provided by your company.

8 Show genuine interest in customer needs – speaking more personally & listening more carefully than just “selling” can go a long way towards helping foster relationships built on trust & respect rather than just transactions being made back-and-forth between parties involved   .

9 Take ownership for mistakes made (if any) & learn from them rather than trying to blame someone else – this shows humility & commitment from management side which goes towards creating better connections amongst stakeholders involved  .

10 Be consistent when following up after sales/services have been completed - check up how things are going afterwards & send follow-up emails/calls as needed; this not only shows concern but also dedication towards providing quality customer service overall!

Adhering to these ethical advertising principles is essential for building trust with customers and clients. Following through on your commitments, being transparent about your company values and objectives, respecting customer privacy, and using authentic content are all key ways to show customers that you’re a trustworthy business. When potential customers see that others have had a positive experience working with you, they’re more likely to be convinced to do business with you as well. And finally, taking ownership for mistakes made and learning from them demonstrates a commitment to providing quality service which will keep customers coming back again and again.