This is what I use! I haven't needed to but any new brush for a long time because of it! Sorry for the crappy link! https://www.amazon.com/dp/B07WTTCXCS/ref=sspa_mw_detail_4?psc=1&pd_rd_w=tQVNf&pf_rd_p=510b7685-091d-40ed-ab1a-815626382515&pd_rd_wg=z5t4e&pf_rd_r=KAFVKRMCCK26PNTS45Y6&pd_rd_r=378e6ed2-ef3a-4c6c-b3f2-6e5f62edfafb&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExNVMzSVVOWjZONEImZW5jcnlwdGVkSWQ9QTAwNzU1NTQxVlZNS1hJVElDQUw0JmVuY3J5cHRlZEFkSWQ9QTAyMjk5MDIzQlhJUEhLS1g0UDk0JndpZGdldE5hbWU9c3BfcGhvbmVfZGV0YWlsX3RoZW1hdGljJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==