Чтобы не вырезал ckeditor, ставим любой символ в <span class="td-icon-car">о</span>
<span class="td-icon-car"></span>
<span class="td-icon-drive"></span>
<span class="td-icon-marker"></span>
<span class="td-icon-phone"></span>
<span class="td-icon-telegram"></span>
<span class="td-icon-vk"></span>
<span class="td-icon-ok"></span>
<span class="td-icon-youtube"></span>
<span class="td-icon-whatsapp"></span>
<span class="td-icon-sale"></span>
<span class="td-icon-exchange"></span>
<span class="td-icon-calculator"></span>
<span class="td-icon-currency"></span>
<span class="td-icon-back"></span>
<span class="td-icon-like"></span>
<span class="td-icon-more"></span>
<span class="td-icon-lightning"></span>
<span class="td-icon-mail"></span>